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11. 发明授权

US4618833A Operational amplifier offset trim that does not change the offset potential temperature drift 失效
标题翻译：运算放大器偏移调整不会改变偏移电位温度漂移
公开(公告)号：US4618833A
公开(公告)日：1986-10-21
申请号：US764450
申请日：1985-08-12
申请人： Ronald W. Russell
发明人： Ronald W. Russell
IPC分类号： H03F3/45
CPC分类号： H03F3/45376 , H03F3/45381
摘要： A JFET operational amplifier input stage is disclosed along with am offset potential trimming circuit. The trimming circuit includes a scaled down compensation stage that is modeled after the input stage and provided with a constant temperature independent bias. This generates a trimming current that varies with temperature inversely with the transconductance of the input stage. A control circuit applies a digitally controlled portion of the trimming current to the input stage so as to compensate the offset potential. The input offset potential is therefore compensated without changing the offset potential temperature drift. Desirably the compensation is achieved after device assembly.
摘要翻译：公开了一种JFET运算放大器输入级以及am偏移电位调整电路。修整电路包括按比例缩小的补偿级，其在输入级之后建模并提供恒定温度独立的偏置。这产生与输入级的跨导成反比的随着温度变化的微调电流。控制电路将微调电流的数字控制部分应用于输入级，以补偿偏移电位。因此，在不改变偏移电位温度漂移的情况下补偿输入偏移电位。理想地，在装置组装之后实现补偿。

12. 发明授权

US3955103A Analog switch 失效
标题翻译：模拟开关
公开(公告)号：US3955103A
公开(公告)日：1976-05-04
申请号：US549195
申请日：1975-02-12
申请人： Ronald W. Russell , Daniel D. Culmer
发明人： Ronald W. Russell , Daniel D. Culmer
IPC分类号： H03K17/68 , H03K17/687 , H03K17/66
CPC分类号： H03K17/6877 , H03K17/68
摘要： An analog switching circuit employs a field effect transistor as a switching element and a regulation circuit for maintaining the bias on the FET constant with changes in the amplitude of an analog signal in the circuit being controlled. The regulation circuit includes a current source, a pair of elements for generating a voltage drop connected in parallel with one another and in series with the current source, and a circuit for maintaining the voltage drops in those circuit elements equal to one another. The circuit elements are connected in series with one another between the source and the gate of the FET, such that the bias on the FET remains constant. A control circuit is operative to disrupt the balance of currents in the circuit elements to cause the FET to become nonconductive.
摘要翻译：模拟开关电路使用场效应晶体管作为开关元件，并且调节电路用于通过控制电路中的模拟信号的幅度的变化来保持FET上的偏置恒定。调节电路包括电流源，用于产生彼此并联并与电流源串联连接的电压降的一对元件，以及用于将这些电路元件中的电压降保持彼此相等的电路。电路元件在FET的源极和栅极之间彼此串联连接，使得FET上的偏置保持恒定。控制电路可操作以中断电路元件中的电流平衡，使得FET变得不导通。

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